2 Observations and analysis

High resolution and high signal to noise ratio spectra of HD 101584 were obtained with the European Southern Observatory (ESO) Coude Auxiliary Telescope (CAT) equipped with the Coude Echelle Spectrograph (CES) and a CCD as detector. The spectra cover the wavelength regions 5360-5400 Å, 6135-6185 Å, 6280-6320 Å, 6340-6385 Å, 6540-6590 Å, 7090-7140 Å, 7420-7480 Å, 8305-8365 Å and 8680-8740 Å. The spectral resolution ranged from 0.165 Å at 6150 Å to 0.210 Å at 8700 Å. We have also obtained 2.5 Å resolution spectra of HD 101584 from 3900 Å to 8600 Å with the 1 m telescope and UAGS spectrograph and a CCD as detector at the Vainu Bappu Observatory (VBO), Kavalur, India. In addition we obtained CCD spectra with the same telescope and Coude Echelle spectrograph, covering the wavelength region 4600 Å to 6600 Å with a resolution of 0.4 Å. All spectra mentioned above were used in this analysis.

All the spectra were analyzed using IRAF software. The equivalent widths of lines were found by fitting a Gaussian. For blended lines de-blending was done by fitting multiple Gaussians. We carried out spectrum synthesis calculations using KURUCZ stellar models (1994). SYNSPEC code (Hubeny et al. 1985) was used for calculating the theoretical line profiles. The gf values were taken from Wiese et al. (1966), Wiese & Martin (1980), Hibbert et al. (1991), Parthasarathy et al. (1992) and Reddy et al. (1997 and references therein). For the analysis of forbidden lines we have used the IRAF software package NEBULAR under STSDAS.